MSRC replied that "The fix is more complex than initially anticipated, and it is very likely that we will not be able to meet the February release deadline due to these memory management issues. The team IS positive that this will be ready to ship on March 13th, however this is beyond the 90-day SLA and 14-day grace period to align with Update Tuesdays."

Note: This issue is a security mitigation bypass and cannot be exploited on its own. An attacker would first need to exploit a separate vulnerability to gain some capabilities in the Edge content process (such as the ability to read and write arbitrary memory locations), after which they could use this vulnerability to gain additional capabilities (namely, the ability to run arbitrary machine code).